Prophet(SAW) said “Whoever believes in Allah and the Last Day, let them treat their guest generously.” Al-Bukhari, Muslim

Abu Shuraih Khuwailid bin `Amr Al-Khuza`i (May Allah be pleased with him) reported: I heard Messenger of Allah (PBUH) saying, “He who believes in Allah and the Last Day, should accommodate his guest according to his right.” He was asked: “What is his right, O Messenger of Allah?” He (PBUH) replied: “It is (to accommodate him) for a day and a night, and hospitality extends for three days, and what is beyond that is charity.” [Al-Bukhari and Muslim].